THE SHIP Si seen by the sketch below, but in order to exclude this deck from calculation of nett tonnage when no cargo is carried hi it, it has a tonnage well usually placed aft with an opening in the deck and in the tonnage well bulkheads known as tonnage openings. These openings must be in conformity with the Ministry of Transport requirements. These steamers are used for measurement cargoes and mixed cargoes, allowing plenty of under deck space in which goods may be sorted, divided, and kept separate. Further decks or "islands" are usually incorporated in shelter deck steamers, these deck spaces being called poop, bridge, forecastle, and 'tween decks, giving a further increase of under deck space. The flush deck type is really a single or 'tween deck ship with the poop, bridge and forecastle combined in a continuous superstructure- Coastal steamers are single deck, and usually single hold steamers with the engines built aft, providing the largest possible hatch openings in the smallest available space. These vessels are only used for coastal trades, and near continental ports. It is to be noted that the type of ship to be adopted is determined by the followingó 1. The trade in which a vessel is to be engaged, 2. The question of draught, together with tonnage, so that at times the deepest draught can be obtained, and at other times, when draught is UBimportant, there is a maximum cargo capacity.